How long can you go without praying?

Gary A. Haugen does a wonderful job of working up to the following statement and question in his book, Just Courage. Haugen explains how taking the "safe" route will not satisfy our "desire for ...significant and meaningful" experiences on this earth and now "we're created by God for adventure."

"Mother Teresa said that she couldn’t imagine doing her work for more than thirty minutes without prayer. Do you and I have work that we can’t imagine doing for thirty minutes without prayer?"

You can read the first chapter here: http://www.ivpress.com/title/exc/3494-1.pdf

This question is near the end...and it is really making me think about my priorities.